Just click on 'I want to read' or 'now reading'. A box will appear, do whatever you need there and click 'ok', or you can just click 'ok' immediately.
Yeah, you have to mark it as "Already read" or "Now reading" to get notifications.
when you finish reading a manga, it gives a you an option to click on Want to read, reading, and read.
when you click reading and read it automatically gives you the notifications
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When you are viewing a manga, there's a part where it says: now reading, already read and want to read. Click on which one you prefer the manga to be, then something should pop up with the tags and add comment. Below it should be a SUBMIT option. Then there you go (=・ω・=) enjoy :)
p.s. you can view all the manga you've marked in your homepage ;)
There's a guideline here. -> On the top row of your homepage, click 'Manga'.
I'm new to this, I just have a question. How to turn your notifications on with there is a new charter to a book you have already read or reading now?#－.－)